E2.2e, E2.2f, E2.2g

(Each question requires a scenario with two entities with several attributes and a relationship between them. You need to draw an ERD. Then, need two sentences to interpret the meaning of the E-R diagram: the first one is about 1:M or M:N relationship; the second one is about the optional and/or mandatory. You can use the same 1:M (or M:N) relationship, but with different participation.)

E2.2e M:N relationship, where participation on one side is mandatory and participation on the other E2.2f M:N relationship, where participation on both E2.2g, M:N relationship, where participation on both side is optional. sides is mandatory. sides is optional